Question

家庭作业问题

使用以下评分政策为课程编写评分程序： a）3个测验评分为10分，加权25％ b）1个中期评分满分100分，加权35％ c）最终分数为100分，加权40％您的类需要一组accessor和mutator方法，完整构造函数，默认构造函数，equals方法和String方法。该类应该只有测验，期中和最终的实例变量。然后，编写一个测试程序，该程序应该读取学生的分数并输出学生的分数和学生的记录。以及学生整个课程和最终字母成绩的整体数字分数。

无论我做什么，我都会遇到错误！所有错误都是＆＃34;错误：找不到符号＆＃34;如果有人能帮我弄清楚什么是错的，我会很高兴的。我花了好几个小时。

这些是我的方法......

import java.util.Scanner;

public class StudentRecord
{
    /***DECLARATIONS**/

    private int quizScore1;
    private int quizScore2;
    private int quizScore3;            
    private int midtermScore;
    private int finalScore;

    /***ACCESSOR METHODS**/

    public int getQuizScore()
    {
        return quizScore1;
        return quizScore2;
        return quizScore3;
    }

    public int getMidtermScore()
    {
        return midtermScore;
    }

    public int getFinalScore()
    {
        return finalScore;
    }

    /***MUTATOR METHODS**/

    public void setQuizScore(int quizScore1, int quizScore2, int quizScore3)
    {
        if (quizScore1 < 0 || quizScore1 > 10)
        {
            System.out.println("Error: Invalid Quiz Grade"); 
        }
        if (quizScore2 < 0 || quizScore2 > 10)
        {
            System.out.println("Error: Invalid Quiz Grade");
        }
        if (quizScore3 <0 || quizScore3 > 10)
        {
            System.out.println("Error: Invalid Quiz Grade");
        }
        else
        {
            this.quizScore1 = quizScore1;
            this.quizScore2 = quizScore2;
            this.quizScore3 = quizScore3;
        }
    }

    public void setMidtermScore(int midtermScore)
    {
        if (midtermScore < 0 || midtermScore > 100)
        {
            System.out.println("Error: Invalid Midterm Score");
        }
        else
        {
            this.midtermScore = midtermScore;
        }
    }

    public void setFinalScore(int finalScore)
    {
        if (finalScore < 0 || finalScore > 100)
        {
            System.out.println("Error: Invalid Final Score");
        }
        else
        {
            this.finalScore = finalScore;
        }
    }

    /***OTHER METHODS***/

    public void studentRecord()
    {
        quizScore1 = 0;
        quizScore2 = 0;
        quizScore3 = 0;
        midtermScore = 0;
        finalScore = 0;
    }

    public void studentRecord(int quizScore1, int quizScore2, int quizScore3, int midtermScore, int finalScore)
    {
        System.out.println("Quiz Score 1: " + quizScore1);
        System.out.println("Quiz Score 2: " + quizScore2);
        System.out.println("Quiz Score 3: " + quizScore3);
        System.out.println("Midterm Score: " + midtermScore);
        System.out.println("Final Score: " + finalScore);
    }

    public boolean equals (StudentRecord otherStudentRecord)
    {
        return (quizScore1 == otherStudentRecord.quizScore1);
        return (quizScore2 == otherStudentRecord.quizScore2);
        return (quizScore3 == otherStudentRecord.quizScore3) ;
        return (midtermScore == otherStudentRecord.midtermScore);
        return (finalScore == otherStudentRecord.finalScore);
    }

    public int getGradeScore()
    {
        int gradeScore;

        gradeScore = (((quizScore1 + quizScore2 + quizScore3) / 3) / 10 * 25) + (midtermScore / 100 * 35) + (finalScore / 100 * 40); 
    }

    public char getLetterGrade()
    {
        int gradeScore;
        char letterGrade;

        if (gradeScore >= 90 && gradeScore <= 100)
        {
            return 'A';
        }
        else if (gradeScore >= 80 && gradeScore <= 89)
        {
            return 'B';
        }
        else if (gradeScore >= 70 && gradeScore <= 79)
        {
            return 'C';
        }
        else if (gradeScore >= 60 && gradeScore <= 69)
        {
            return 'D';
        }
        else 
        {
            return 'F';
        }
    }

    public String toString()
    {
        return ("Grade Score is " + gradeScore + "and letter grade is " + letterGrade);
    }

}

......这是我的测试程序......

import java.util.Scanner;

public class CalculatingStudentGrade
{
    public static void main(String[] args)
    {
        Scanner keyboard;
        int quizScore1, quizScore2, quizScore3, midtermScore, finalScore;

        keyboard = new Scanner(System.in);

        System.out.println("Enter Quiz 1 score:");
        quizScore1 = keyboard.nextInt();
        System.out.println("Enter Quiz 2 score:");
        quizScore2 = keyboard.nextInt();
        System.out.println("Enter Quiz 3 score:");
        quizScore3 = keyboard.nextInt();

        StudentRecord.getQuizScore();
        StudentRecord.getMidtermScore();
        StudentRecord.getFinalScore();

        StudentRecord.setQuizScore();
        StudentRecord.setMidtermScore();
        StudentRecord.setFinalScore();

        StudentRecord.StudentRecord();
        StudentRecord.getGradeScore();
        StudentRecord.getLetterGrade(); 
    }
}

Answer 1

你不能在这里返回多个声明。我认为它将是所有测验的总和。所以把它归和，然后再回来。

  public int getQuizScore()
    {
        return quizScore1;
        return quizScore2;
        return quizScore3;
    }

而不是

public int getQuizScore()
{
     return quizScore1+quizScore2+quizScore3;
}

家庭作业：记录学生成绩的班级

1 个答案: